Safety brake apparatus



Sept. 22, 1931. A. SCHORNO SAFETY BRAKE APPARATUS Filed Feb. 28, 1927 Patented a. 3 m SWITZERJIAND a j Y Application fiieafrb ary 2s, 927, I serial -na ratus, such as of the type employed in mine 7 hoists. "Ithasto do particularlyivvith forms of such apparatus wherein provision s made itsoperating shaft, for. such. purposes as to for theuncoupling of the Winding; druin from permit adj ustmentofthe length'of thewindl a drum.

, in which the invention? may beieinbodied,

' Another objectisthe;provislon i ofiappaE ing rope, oradjustment of the drum: with? respect to the shaft or' with respect to an as sociated drum" adaptedftojbe operated byith'e shaft and conjointly with. the admstab e v H .r

- -f0r'examp1e,1n-m1ne'hoistmgnengmes ofthe: e

" double; rumiy eg.i 1-whihithi h i i gr pex- ..is]vgoundzonto one drum'while heing unwound 65 I The general object of the invention isflthe Provision of app a -0 't ypeh vin f, in a 9 1 01 3omtlyeoperated rum,i1t may"ber automatically operating safetyprovisions ef- "fective to. limit or preventunintentional ro- 'tation of the drum while itisuncoupled from its normal operating means ratus of this typeiin which theflsa-fetyrdevices' are disconnected orcut 011t vvlien flthe appaj ratus is in normal operating conditiom but its normal operating means.

' A further obj ect I is a'jprovisjio'ri apparatus of this type which is positiveandcer-y tain in operation and simple'inconstrjuctiong Other and further objects i beflpointed' out or indicated hereinafter or willi'appear to one skilled int-he art'uponf anfunderstanding ofthe invention or its employmentorpra tice I V j V In the drawings part of specie fication, I show in diagrammatic:orschematie fashion, various arrangements of apparatus but .it is to be understood that these arehre presented for purpose of illustration only, and are not to be accorded any interpretation calculated to limit the "claims short;

true and most comprehensive scope' offt vention in the art. v

In the drawings-Figlfl is i Samm p sif t at ho mr'in illustrations other garran a oma ici ont ol ixde 'ces; "the gd umsing V v Jomnsrocx' company or V V "Fig iti n-iofihke.app ratusidi diagrammatic} f Sim-1 ements ilofiithe 'shown'inelevation.-

1 ig- 5f Sx top Y QWO fldlusting device;-

In various apparatus 1 ne s nykfromtimetotime to-ungQu-plejeither -o' ez mbbth -o ,ithe onsuchipur os'es I oi -thev-ropeflor for fiadj sting fthe lengt -hq s n midifierentz ast Itp-is impolft ant that very positive a co fol jof rthe' uncoulPl ddrum bemaintaine ily are'fheavilyfloaded; and

' are cut in automatically; incident to-ithe'r 'uncoupling or theunclutching'of the drum from holding ggdevices or brake's imayfresultfm the fl iqnbfithedrum byi ad withi esulti ings'eriqus;consequences. j Wh mthe dru under'giioriri 1,: operating control; however, iti" must b e frce fQiErOtat-iOn bythjejnormal ,op- 'eratingmeansineither}directioni a s' desired; vvithoutginterferenc from emergency-safety' J i-,, ,@eo The presentinvention provides a form of] crating means. Thisg automaticisafety con-- qnormalioperationg f ith'e machine; but is aufrornits normal opei'ating; means; 'fthemventlon vvi i cid nt th disconn ction; of he: Ad iun drums arranged-g for operatien ybya singled;

shaft, 1together with oertaiii;portions 101f Ythe f "j braking and automatic safetyi equipmen e; safetyes wjt hg f y be j i: i g 1. a h V;

h drums usualg ,to trip the brake. V The electro-mag'n carries the two winding idrnnis or operating members 11 and 12.- The drum 12 is provided with a clutch mechanism by Whichitmay be 'operatively securedto or released from the shaft 10. A plate 10, which is freely rotat-r able about the shaft 10, is' preyided with pins 11 arranga w extend throli'ghi-apertlires in the clutch plate 14 and through apertures-in gone 'ofithe interna-lbtacing plates of-the drum.

L i4Ei i i 4 ildil f l h. e. 30

lar on'the end of a sleeve 42 atawnh snap- .erating'mechanism 16 for holding brake 15.

The pins 41' are normally maintained mien-1' gagementaintheclntch plate and ldrl lmtb ace 5 apertures by afspring 45-when it'is desired to V permitthefdfnm' toqr'otate with the shaft 10. The eluteh engaged bygmoy'ement of I mechanism 3 316 ope'rat'e {brakewhich y'iiient witharaws pins 41 ,fr'om the dru 1 12 bnaee apert ires againstthe' action of spring 7 :45, which, when brake- 15 isieleased -tcauses re-engagement' of thejclntc'hZ- I g The numeral 1 5- illustrates a holding ele- 'rflent er brake whieh is utilized for holding 7125' the drum 12 stationary when itis-nnconpled eoupled frbfn?fthe' shafti {This 1 includes an :bperating' mean "tor hrake '17, gsuch; as the springl'sg ajga st he.pre snrejef whieh 'the "Brake maybe etrac'tedbv operationof'the 'eyer 19,; and" =11 d retra'cted bya ling tripping ""de'v'ice operable by s anr e l'eetrd-m' I ping devie ei effeqtive positiomiann-a spring 1-22 by 'whi'ch' thetripping device ma be aetuf ate-a whenitheeleetro magnet is deener'gi'zed, is ergi zerd from abet-m otcurrent Qtinthe conitiel c'iren itaa 'ltwi' llbe uncterst'ood th at prenincouplin tlieeiami frdni the shaft. 'tne hel d 55 brak 15 is operated-t secilrethe i drum.

when-the :ke15 is off, hilt opening the V nirenit' attltos terminalsiwhen the-brake is a pfilied. An emergency switch devijc e as i rovided;rortiesing the; cpn-trol c'iibtiiii P hei fi ie The switgh y bes saaa taabito xea-posifiens v relative to the shaft 30, however, being a ratchet wheel 46 secured toshaft and a pawl 17 adjustable with respect to the ratchet the operation of the apparatus, when "t 13 comes desirable to u ncoulqleithe clrum l 2 e1 shaftftlie "einei' ithi28t "firsr'at iis'tedtbti posit njwher flfitfcloses r eircnit 25 across the terminals'29F The'hold- "ifig hr'zike' 15'f'is then set to perform its func- Q' iQ A- S thern rmaleeeees or holdi h drum stationary. Incidental to setting of the holdiiig hrake 15,tlie-switch '261is opened,

that thisfd'oes' not open the control circuit 25 V ito-releas'e,thesafetyhrake :17, as the circuit is bridged by the ernergeneyrswitch 28 so. that theltri'pping jniagnet 21;; ren'iains energized. Hon'ever in thezeventl the brake 15;,failst0 hoid the firm-1 and tlie-latterfst'arts to re- :t'a'te' inleither.direetionggthe emergency switch 28 w il-L Ebe inoved'to; open'ithe control "circuit,

' whereupon the trippingdevice 20 wi-11 be opequipped wit-h a setting device 32 including secure the drum.

111 the arrangeinnt illn stratedin Fig. 2, fit he switch, which isoperated incident to the 'uncou'plingtof the-drain; is desi n ted by: ref 61361166 numeral angel: is operated automati- -;;cal'ly'ffr'om-the clutch Eli-i4; In this figure the tripping mechanism is not shown,jbnt:it.1nay b salt-11mm? that'lillustrat etl in v1,= heing cbnt'ro'flled imthe -cirouit25. i-The emer- 13 gency switch-28.15 arrang d andv ,Qpe d as; illustrated ;Eig. j' to control the circuit "25: ati the ftelimif tls 29 I In Vthej'arrangem'ent the emergency sw tch ;2;;arra;nged, ancl operated in llikeiash-ion, but the normal clos- ,ingfslwitohiQGi is operated in.;conjunction with the :mech'ztriifinifor unenpling a depth {indicator 34; an op efration. which; isfperformed sprior to thenncouplingiofthe, drum. 12 from the .sh'aftJ In this arrangement, the-"depth indicator; 3115 operated by ggears 35 536 clriven from the shaft 30. The gear 36 is j tablel n ud nally n' sh ft 30 y a ,screwfldeyice 37, wherehyit may be moyed into and out ofn esh withjgearflzi When iiiovecl out-riot nie'sh the' switch lever '38 is e'nga'gea, stop3 9 "moved tobpen the switch I this operation 'takingfplace, of "conrse, after the holding brake '15 {has "'heen applied and;they-emergency switch '28 get to cl'o se'the controlfcirciiit across thefter jiiiiii als 291 g 5 Infthe arrangement ilhi'str a'ted in Fig. 4, M' s W-ittr 28 .15 operated by a i' a'l 'lei" e tojdi-ive'n from shaft jso means tiff-"Thercentrifngal g -'-t'o operatelto' openr the eniaiiyfsilightfrotatienal rality of means for retardinglmovement said operating member,- 1neansfor control-i otherinto and out of holding position,f means trolling operation of one"of said ret aining understood that in lthe -arrangementsfjillus; j

trated in Figs." 8 andl'thetripping mecha -5 in the manner illustrated in Fig. "I. v a lVliat I claim is: b I a f j r I 1. In apparatusofthe character' described, an operating member, driving meansthere-j nism is operated inthe'control circuit 25,,as' jofsaid cont-acts'up'onifailureofsaid last men'-,; 1

member against operating movementfand disposed for movement independently of each i I for controlling movement of one ofsaid ere, ments into holding position, a plurality" of devices each operable to control said controlling means, means for actuatingone of said controlling devices, and means responsive to operating movementof said member'and being operable upon such movement toefiect. actuation of the other of said controlling devices.

2; vIn apparatus of the charactergde scribed, a rotatable operating member, a pluling movement of one offsaidretarding means 1n dependence on movement of, another of said retarding means, and means for operat ing said controlling meansup0n failure f operation of oneoi .said retarding means v p '3. In a device of the-character described,

. a plurality ofrotat'able-operating member plurality of'retain'ing means for one ofsa operating members, electrloal'fmeans'for con means, and means for actuating saidf'elecf brakes; and means-iorbridging another pair f itioned brakeft prevent rotation of-saiddrumi-e 6. ;In"dru'm'controlling-meansfor-hoisting? V device-s,aplurality ofrotatable drums, means for drivings'aid drumspmeansfordisconnect ing one or 'said' v drums -from Said driving i means, a lplurality v of brakes? for retaining; said drum in'predeterminedposition, electroma y P d ie iiSf0r controlling": I

the actuationof'saidcontrol means;

" In testimony whereof I havehereunto sub 1 V scribed my name; this 1 0 day of liebruary .1927 ,at Zurich, Switzerland. 7 ABIH RL QR 1' trical control means upon failure rone-01- said retaining means to preventrotationaof said operating member, said control actuat. 3,

ing means and one ofsald retalnlng means 00- v operating to .COIIEIOLOPQIQIIOII 01 said electrically-controlle'd retaining means. J-

4. In a'structure oi the character hereiiibe fore described, rotatable drums, mean-s for-rotatmg said drums, means for dlsconnec't ng one of saiddrums from said drivingmean's, Z

brakes for retaining said disconnected drum J J in a predetermined position, an electrically operated trip for controlling the,m'ove1'nentff of one of said brakes, a source of electric current for operating sald tr p, and contacts 1n circuit with said trip operating means and i said source of current arranged to be bridged by the action of another of said brakes. r 5. In a structure ofthe character hereinbe fore described, rotatable drums, means for ro tating said drums, means for di-sconnectng- "one of saiddrums from saidtdriving means, V brakes for retaining said disconnected drumf'" in a'predetermined position," an electrically,

operated trip for controlling them'oveai ment of one of said brakes, a'source of electric current for operating saidtrip, a pluralityof' l I pairs of contacts, the'contacts being in. circuit f Q a with said trip andsaidsource of currenfilonels "onefof said brakes ,"means operable by an- 'i other ofsaidbrakesqforjjpartially eflecting- 7' operation ofsaid electro-magnetic control means, and means operableuponmovement i of saiddisconnected drum for cooperation in .7 j

. ii'oo 1165 

